hey..... common problem for all c5's. try techron concentrate. that might do the trick. you most likely have a fuel sending problem. expensive to fix (about 800 dollars) its caused from sulpher build up but techron and good gas only and it might be the solution. i actually changed the unit and the problem came back. since then i have used that stuff in every third tank full and it has not happened since. if you search the forum you will find this problem alot.......

To delete the code with the key on hold 'option' and press 'fuel' four times the dic will then scroll through all the codes in the car, you can either watch em all or press reset to skip to manual mode. If i remember youll have p1416 hc h is historical c is current. Use 'option' and 'trip' to change sections and 'fuel' and 'gauge' to scroll through all the codes in a section. You can either clear the codes one at a time by viewing them and holding reset' until it beeps, or holding 'reset' while the section is being displayed. This an also be done while the engine is running. If you reset and something is still causing the code condition itll come right back. I got bored in traffic and ran through all the codes i had this morning.